We are very proud of this series of motors and want yours
to give you the best possible service. Please read this manual
in its entirety and follow its instructions to the best of your
ability. If you have any questions not covered here, please feel
free to call us at Area Code (501) 646-1656

SUITABLE MODELS:

These motors are intended for sport and scale type model airplanes
that their size and weight would fit.

WARNING:

There is always the possibility you may lose control of your
model. Do not fly in any location where your model might strike
people or do property damage should this occur.

INSTALLATION:

Your Fox motor mounts in the normal manner. If your airplane
calls for a firewall mount, we recommend the Fox #50403 one piece
metal mount, as it is very rigid. If your airplane is designed
with a hardwood beam type mount, be sure they are well braced
between the two beams, and the beams are gusseted to the firewall,
and, preferably, to one another. Flimsy motor mounts will allow
the engine to vibrate excessively and may damage the model and
cause foaming of the fuel tank. Also, excessive vibration can
cause glow plug failure. If a cowling is used, provisions should
be made for both air inlet and outlet.

PROPELLERS TO USE:

We recommend you always use a hardwood propeller of the size
shown:

Large Model

Small Model

Fox 36RC or CL

10" dia. x 6" pitch

9" dia. x 7" pitch

Fox 40RC or CL

10" dia. x 6" pitch

9" dia. x 7" pitch

We urge that you do not use nylon propellers because their flexible
nature causes more vibration. Also, if you should accidentally
get hit by one, you will be hurt worse than if hit with a wooden
propeller.

WARNING:

Always keep clear of the propeller. It is possible for a propeller
to cut off a finger or for a piece to come off and put an eye
out.

FUEL TO USE:

Model airplane fuels are a mixture of methanol, oil, and various
additives to improve ignition, add power, and cut down carbon
deposits. It is important to use only fuel with a castor oil
lubricant, otherwise, your engine life will be drastically reduced.
Nitro is another fuel ingredient that is often used. Its function
is to "advance the spark". To determine if you need
any, or more nitro, start your engine, open the throttle wide
open and set your high speed needle for maximum power, then back
it out slightly. Do all this with your booster battery connected.
Now remove your booster leads - if your motor slows down, more
nitro is indicated. Fox Gold Star (5% nitro) and Duke's Fuel
(10% nitro) have castor oil lubrication and should work satisfactorily.

WARNING:

Model airplane fuel is both flammable and extremely poisonous.
Use the same safety precautions you would use with a can of gasoline
or a bottle of poison.

GLOW PLUGS

This series motors all use the long thread glow plug. We recommend
standard type for control line motors, and our RC or 4 cycle
plug for RC use. The 4 cycle plug costs a bit more but does give
a more reliable idle.

TO START YOUR MOTOR:

1. Mount your motor securely on a mount that does not
put a strain on the mounting lug. #4-40 screws are the size to
use. The fuel supply should be so positioned that the fuel level
is no more than 1/2" above or below the fuel nipple. The
fuel line should not be higher than the fuel level at any point.
Use Fox medium size fuel line.

In case the factory needle settings have been disturbed, re-set
following steps 2, 3 and 4.

2. Close the throttle - adjust the idle stop screw
(the one on top), so you can see a hairline opening in the intake
when the throttle is pushed closed.

3.Holding the throttle shut, screw the low
speed needle (one on the exhaust side) in until it is snug, then
back out one full turn.

4. Screw the high speed needle in until is seats, then
back out four full turns.

5. Set the throttle at 1/3 open throttle position,
connect the glow plug wire and crank counter clockwise with a
quick, snappy, flipping motion. If it does not start in a few
flips, try choking it a turn or two. It should start and run
at these settings.

WARNING:

A model airplane motor can get hot enough to cause a serious
burn. Do not touch the motor right after it has been running.

BREAK IN:

Your Fox motor has a closely fit piston which requires from
15 to 30 minutes running before it will idle reliably. No special
fuel or propeller is necessary, however, take care that the motor
is not run overlean (leaned in to the point that is loses power).

WARNING:

Never fly a control line model within 200 feet of power lines.
Death by electrocution is possible if your model comes near a
power line. Direct contact is not necessary.

FINE TUNING YOUR FOX SERIES 6 CARBURETOR

The 36RC and Compact 40RC all use the same carburetor. The
most reliable settings are those in which the lower half of the
throttle range is as lean as possible without stalling, becoming
slightly rich in the 3/4 to full throttle setting. The adjusting
screw on the exhaust side is the low speed needle. The adjusting
screw opposite the exhaust is the high speed needle, Both needles
screw in to lean and out to richen. The adjusting screw on top
of the carburetor limits how far the throttle will go closed
and is used to control the idle speed. The carburetor assembly
is held is place with a set screw and gasketed with silicone
rubber compound. Both the high speed needle and low speed needle
purposely have loose threads to allow the needle to have a little
"float" to find its seat. No carburetor can work perfectly
for all propeller sizes, altitudes, fuel viscosities and tank
locations. If after your motor has been broken in you do not
like the way your carburetor performs, you can tailor it to your
liking by working on the low speed needle. If you goof, you have
not ruined an expensive part.

If the motor will not get rich enough at high speed:

File 1/64 or so off the end at a 45 degree angle.

If the motor is lean at midrange:

Sand a radius on the edge shown.

If the mid-range can be made to work fine by screwing the
needle in a bit too much for a good idle:

First - Remove from rest of model
Second - Wash under hot water faucet
Third - Remove plug and rear cover and wash in stoddard solvent
Fourth - Now check and if it turns over freely, it is probably
not hurt

OTHERWISE, PROCEED TO DISASSEMBLE

Inspect all parts - discard any that appear damaged or worn.
New parts can be obtained directly from the factory by calling
(501) 646-1656 during business hours. If repairs are more than
you want to handle and you desire us to rebuild it for you, mail
directly to us. We will disassemble the motor, replace all necessary
parts, test run and return the motor to you charges collect.
It has not proven practical to make any sort of estimates. We
will assure you, however, that our charges will never be more
than 60 percent of the list price of a new motor.

GOOD LUCK, AND ENJOY YOUR FOX MOTOR -
IT IS ONE OF THE FINEST BUILT ANYWHERE.